利用redis实现多线程安全自增ID

正文

添加依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.56</version>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>RELEASE</version>
        <scope>compile</scope>
    </dependency>
</dependencies>

<repositories>
    <repository>
        <id>maven-public</id>
        <url>http://172.20.1.100:8081/repository/maven-public/</url>
        <releases>
            <enabled>true</enabled>
            <updatePolicy>always</updatePolicy>
        </releases>
        <snapshots>
            <enabled>true</enabled>
            <updatePolicy>always</updatePolicy>
        </snapshots>
    </repository>

    <repository>
        <id>3rdParty</id>
        <name>company private</name>
        <url>http://172.20.1.100:8081/repository/3rdParty/</url>
    </repository>

    <repository>
        <id>maven-snapshots</id>
        <name>company snapshots</name>
        <url>http://172.20.1.100:8081/repository/maven-snapshots/</url>
    </repository>
</repositories>


<pluginRepositories>
    <pluginRepository>
        <id>maven-public</id>
        <url>http://172.20.1.100:8081/repository/maven-public/</url>
        <releases>
            <enabled>true</enabled>
            <updatePolicy>always</updatePolicy>
        </releases>
        <snapshots>
            <enabled>true</enabled>
            <updatePolicy>always</updatePolicy>
        </snapshots>
    </pluginRepository>
</pluginRepositories>

<distributionManagement>
    <repository>
        <id>maven-releases</id>
        <url>
            http://172.20.1.100:8081/repository/maven-releases/
        </url>
    </repository>
    <snapshotRepository>
        <id>maven-snapshots</id>
        <url>
            http://172.20.1.100:8081/repository/maven-snapshots/
        </url>
    </snapshotRepository>
</distributionManagement>

添加配置类

FastJson2JsonRedisSerializer.java

package com.creambing.redis.conf;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;
import org.springframework.util.Assert;

import java.nio.charset.Charset;

/**
 * FileName: FastJson2JsonRedisSerializer
 * Author:   creambing
 * Date:     2019-05-10 16:40
 * Description: fastjson序列化代替redis自己的序列化
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
public class FastJson2JsonRedisSerializer<T> implements RedisSerializer<T> {
    private ObjectMapper objectMapper = new ObjectMapper();
    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class<T> clazz;

    static {
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
        //如果遇到反序列化autoType is not support错误，请添加并修改一下包名到bean文件路径
        // ParserConfig.getGlobalInstance().addAccept("com.xxxxx.xxx");
    }

    public FastJson2JsonRedisSerializer(Class<T> clazz) {
        super();
        this.clazz = clazz;
    }

    public byte[] serialize(T t) throws SerializationException {
        if (t == null) {
            return new byte[0];
        }
        return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    public T deserialize(byte[] bytes) throws SerializationException {
        if (bytes == null || bytes.length <= 0) {
            return null;
        }
        String str = new String(bytes, DEFAULT_CHARSET);

        return JSON.parseObject(str, clazz);
    }

    public void setObjectMapper(ObjectMapper objectMapper) {
        Assert.notNull(objectMapper, "'objectMapper' must not be null");
        this.objectMapper = objectMapper;
    }

    protected JavaType getJavaType(Class<?> clazz) {
        return TypeFactory.defaultInstance().constructType(clazz);
    }
}

RedisConfig.java

package com.creambing.redis.conf;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.lettuce.core.RedisURI;
import io.lettuce.core.cluster.ClusterClientOptions;
import io.lettuce.core.cluster.RedisClusterClient;
import io.lettuce.core.cluster.api.StatefulRedisClusterConnection;
import io.lettuce.core.resource.ClientResources;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.util.StringUtils;

/**
 * FileName: RedisConfig
 * Author:   creambing
 * Date:     2019-05-10 16:38
 * Description: redis设置
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
@Configuration
public class RedisConfig {


    @Value("${spring.redis.cluster.nodes}")
    private String clusterNodes;

    @Value("${spring.redis.password}")
    private String password;

    @Bean
    public RedisTemplate<Object, Object> redisFastJsonTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        //使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
        //Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);
        //使用Fastjson2JsonRedisSerializer来序列化和反序列化redis的value值 by zhengkai
        FastJson2JsonRedisSerializer serializer = new FastJson2JsonRedisSerializer(Object.class);
        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        serializer.setObjectMapper(mapper);
        template.setValueSerializer(serializer);
        template.setHashValueSerializer(serializer);
        //使用StringRedisSerializer来序列化和反序列化redis的key值
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.afterPropertiesSet();
        return template;
    }

    @Bean(name="clusterRedisURI")
    RedisURI clusterRedisURI(){
        String[] nodes = clusterNodes.split(",");
        if(nodes.length<1){
            throw new RuntimeException("redis 集群配置有问题,请检查!");
        }
        String[] oneNode = nodes[0].split(":");
        if(oneNode.length<2){
            throw new RuntimeException("redis 集群配置第一个有问题,请检查!");
        }
        String ip = oneNode[0];
        String port = oneNode[1];
        RedisURI.Builder builder = RedisURI.builder().withHost(ip).withPort(Integer.valueOf(port));
        if (StringUtils.isEmpty(password)){
            return builder.build();
        }
        return builder.withPassword(password).build();
    }

    @Bean
    ClusterClientOptions clusterClientOptions(){
        return ClusterClientOptions.builder().autoReconnect(true).maxRedirects(1).build();
    }

    @Bean
    RedisClusterClient redisClusterClient(ClientResources clientResources, ClusterClientOptions clusterClientOptions, RedisURI clusterRedisURI){
        RedisClusterClient redisClusterClient= RedisClusterClient.create(clientResources,clusterRedisURI);
        redisClusterClient.setOptions(clusterClientOptions);
        return redisClusterClient;
    }

    /**
     * 集群连接
     */
    @Bean(destroyMethod = "close")
    StatefulRedisClusterConnection<String,String> statefulRedisClusterConnection(RedisClusterClient redisClusterClient){
        return  redisClusterClient.connect();
    }
}

RedisIncrIdUtils.java 给一个唯一值 userId 根据它在redis中建立一个唯一的数字 id

package com.creambing.redis.conf;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

/**
 * FileName: RedisIncrIdUtils
 * Author:   creambing
 * Date:     2019-11-07 16:22
 * Description:
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
@Component
@Slf4j
public class RedisIncrIdUtils {

    private static final String REDIS_KEY_USERID2NUMID = "userid2numid";

    private static final long MAX_NUMID = Math.round(Math.pow(2,32)-1);

    private static final String REDIS_KEY_NUMID = "numid";

    @Resource
    private RedisUtils redisUtils;

    public synchronized Long getNumId(String userId){
        Object numId = redisUtils.hget(REDIS_KEY_USERID2NUMID,userId);
        if(numId!=null){
            return Long.parseLong(String.valueOf(numId));
        }else {
            log.warn("userId [{}] has no numid,i will create",userId);
            long newNumId = redisUtils.incr(REDIS_KEY_NUMID,1);
            redisUtils.hset(REDIS_KEY_USERID2NUMID,userId,newNumId);
            if(newNumId>MAX_NUMID){
                log.error("numid [{}] exceeds the maximum value [{}]",newNumId,MAX_NUMID);
            }
            log.info("userId [{}] had a numid [{}]",userId,newNumId);
            return newNumId;
        }
    }
}

RedisUtils.java

package com.creambing.redis.conf;

/**
 * FileName: RedisUtils
 * Author:   creambing
 * Date:     2019-05-27 18:29
 * Description: redis工具类
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;


@Component
public class RedisUtils {

    @Qualifier("redisFastJsonTemplate")
    @Autowired
    RedisTemplate<Object, Object> redisTemplate;

    /**
     * 指定缓存失效时间
     *
     * @param key  键
     * @param time 时间(秒)
     * @return
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 根据key  获取过期时间
     *
     * @param key 键  不能为null
     * @return 时间(秒)  返回0代表为永久有效
     */
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }

    /**
     * 判断key是否存在
     *
     * @param key 键
     * @return true  存在  false不存在
     */
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 删除缓存
     *
     * @param key 可以传一个值  或多个
     */
    @SuppressWarnings("unchecked")
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete(CollectionUtils.arrayToList(key));
            }
        }
    }

    //============================String=============================

    /**
     * 普通缓存获取
     *
     * @param key 键
     * @return 值
     */
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }

    /**
     * 普通缓存放入
     *
     * @param key   键
     * @param value 值
     * @return true成功  false失败
     */
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

    }

    /**
     * 普通缓存放入并设置时间
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒)  time要大于0  如果time小于等于0  将设置无限期
     * @return true成功  false  失败
     */
    public boolean set(String key, Object value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 递增
     *
     * @return
     */
    public long incr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递增因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, delta);
    }

    /**
     * 递减
     *
     * @return
     */
    public long decr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递减因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, -delta);
    }

    //================================Map=================================

    /**
     * HashGet
     *
     * @param key  键  不能为null
     * @param item 项  不能为null
     * @return 值
     */
    public Object hget(String key, String item) {
        return redisTemplate.opsForHash().get(key, item);
    }

    /**
     * 获取hashKey对应的所有键值
     *
     * @return 对应的多个键值
     */
    public Map<Object, Object> hmget(String key) {
        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * HashSet
     *
     * @param key 键
     * @param map 对应多个键值
     * @return true  成功  false  失败
     */
    public boolean hmset(String key, Map<String, Object> map) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * HashSet  并设置时间
     *
     * @param key  键
     * @param map  对应多个键值
     * @param time 时间(秒)
     * @return true成功  false失败
     */
    public boolean hmset(String key, Map<String, Object> map, long time) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 向一张hash表中放入数据,如果不存在将创建
     *
     * @param key   键
     * @param item  项
     * @param value 值
     * @return true  成功  false失败
     */
    public boolean hset(String key, String item, Object value) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 向一张hash表中放入数据,如果不存在将创建
     *
     * @param key   键
     * @param item  项
     * @param value 值
     * @param time  时间(秒)注意:如果已存在的hash表有时间,这里将会替换原有的时间
     * @return true  成功  false失败
     */
    public boolean hset(String key, String item, Object value, long time) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 删除hash表中的值
     *
     * @param key  键  不能为null
     * @param item 项  可以使多个  不能为null
     */
    public void hdel(String key, Object... item) {
        try {
            redisTemplate.opsForHash().delete(key, item);
        }catch (Exception e){
            e.printStackTrace();
        }

    }

    /**
     * 判断hash表中是否有该项的值
     *
     * @param key  键  不能为null
     * @param item 项  不能为null
     * @return true  存在  false不存在
     */
    public boolean hHasKey(String key, String item) {
        return redisTemplate.opsForHash().hasKey(key, item);
    }

    /**
     * hash递增  如果不存在,就会创建一个  并把新增后的值返回
     *
     * @param key  键
     * @param item 项
     * @param by   要增加几(大于0)
     * @return
     */
    public double hincr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, by);
    }

    /**
     * hash递减
     *
     * @param key  键
     * @param item 项
     * @param by   要减少记(小于0)
     * @return
     */
    public double hdecr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, -by);
    }

    //============================set=============================

    /**
     * 根据key获取Set中的所有值
     *
     * @param key 键
     * @return
     */
    public Set<Object> sGet(String key) {
        try {
            return redisTemplate.opsForSet().members(key);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 根据value从一个set中查询,是否存在
     *
     * @param key   键
     * @param value 值
     * @return true  存在  false不存在
     */
    public boolean sHasKey(String key, Object value) {
        try {
            return redisTemplate.opsForSet().isMember(key, value);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将数据放入set缓存
     *
     * @param key    键
     * @param values 值  可以是多个
     * @return 成功个数
     */
    public long sSet(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().add(key, values);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 将set数据放入缓存
     *
     * @param key    键
     * @param time   时间(秒)
     * @param values 值  可以是多个
     * @return 成功个数
     */
    public long sSetAndTime(String key, long time, Object... values) {
        try {
            Long count = redisTemplate.opsForSet().add(key, values);
            if (time > 0) expire(key, time);
            return count;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 获取set缓存的长度
     *
     * @param key 键
     * @return
     */
    public long sGetSetSize(String key) {
        try {
            return redisTemplate.opsForSet().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 移除值为value的
     *
     * @param key    键
     * @param values 值  可以是多个
     * @return 移除的个数
     */
    public long setRemove(String key, Object... values) {
        try {
            Long count = redisTemplate.opsForSet().remove(key, values);
            return count;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
    //===============================list=================================

    /**
     * 获取list缓存的内容
     *
     * @param key   键
     * @param start 开始
     * @param end   结束0  到  -1代表所有值
     * @return
     */
    public List<Object> lGet(String key, long start, long end) {
        try {
            return redisTemplate.opsForList().range(key, start, end);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 获取list缓存的长度
     *
     * @param key 键
     * @return
     */
    public long lGetListSize(String key) {
        try {
            return redisTemplate.opsForList().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 通过索引  获取list中的值
     *
     * @param key   键
     * @param index 索引index>=0时，  0  表头，1  第二个元素，依次类推；index<0时，-1，表尾，-2倒数第二个元素，依次类推
     * @return
     */
    public Object lGetIndex(String key, long index) {
        try {
            return redisTemplate.opsForList().index(key, index);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @return
     */
    public boolean lSet(String key, Object value) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒)
     * @return
     */
    public boolean lSet(String key, Object value, long time) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            if (time > 0) expire(key, time);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @return
     */
    public boolean lSet(String key, List<Object> value) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒)
     * @return
     */
    public boolean lSet(String key, List<Object> value, long time) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            if (time > 0) expire(key, time);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 根据索引修改list中的某条数据
     *
     * @param key   键
     * @param index 索引
     * @param value 值
     * @return
     */
    public boolean lUpdateIndex(String key, long index, Object value) {
        try {
            redisTemplate.opsForList().set(key, index, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 移除N个值为value
     *
     * @param key   键
     * @param count 移除多少个
     * @param value 值
     * @return 移除的个数
     */
    public long lRemove(String key, long count, Object value) {
        try {
            Long remove = redisTemplate.opsForList().remove(key, count, value);
            return remove;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    public RedisTemplate<Object, Object> getRedisTemplate(){
        return redisTemplate;
    }

}

配置文件添加

spring.redis.cluster.nodes=172.20.1.202:7000,172.20.1.202:7001,172.20.1.202:7002,172.20.1.202:7003,172.20.1.202:7004,172.20.1.202:7005
spring.redis.password=

测试多线程

RedisThread.java 中利用 incr() 获取自增id

package com.creambing.redis.conf;

/**
 * FileName: RedisThread
 * Author:   creambing
 * Date:     2019-11-07 15:17
 * Description:
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
public class RedisThread implements Runnable {

    private final RedisUtils redisUtils;

    public RedisThread(RedisUtils redisUtils) {
        this.redisUtils = redisUtils;
    }

    @Override
    public void run() {
        for(int i=0;i<10;i++){
            try {
                System.out.println(redisUtils.incr("id",1));
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            Thread.yield();
        }
    }
}

RedisUtilsTest.java

package com.creambing.redis.conf;

import com.creambing.redis.RedisApplicationTests;
import org.junit.jupiter.api.Test;

import javax.annotation.Resource;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

import static org.junit.jupiter.api.Assertions.*;

/**
 * Created by [zhaobing] [creambing.github.io]
 * Date: 2019/11/7
 * Time: 15:16
 */
class RedisUtilsTest extends RedisApplicationTests {

    @Resource
    RedisUtils redisUtils;


    @Test
    void incr() {
        List<Thread> threads = IntStream.range(0, 10).mapToObj(i -> new Thread(new RedisThread(redisUtils))).collect(Collectors.toList());
        threads.forEach(Thread::start);
        for (Thread t : threads) {
            try {
                t.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("redisId:" + redisUtils.get("id"));
    }

    @Test
    void decr() {
    }
}

参考资料